请大佬们看看是哪里错了，想破头想不出呜呜

sktt1fakerk

#-*- coding:utf-8 -*-
import re
from bs4 import BeautifulSoup
import xlwt
import sqlite3
import urllib.request,urllib.error
import urllib.parse



def main():
    gethtml(url = "https://movie.douban.com/top250?start=0")
    getdata(baseurl = "https://movie.douban.com/top250?start=0")


# def find_thing():



def gethtml(url):
    html = ""
    headers = {
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36"
    }
    req = urllib.request.Request(url, headers=headers)
    response = urllib.request.urlopen(req)
    print(response.read().decode("utf-8"))
    # return html


def getdata(baseurl):
    datalist = []
    for i in range(0,1):
        url = baseurl + str(i*25)
        html = gethtml(url)

        soup = BeautifulSoup(html,"html.parser")
        for item in soup.find_all('div',class_ ="item"):
            datalist.append(item)






if __name__ == '__main__':
    main()








Traceback (most recent call last):
  File "C:/Users/11929/PycharmProjects/untitled1/htmlfirst.py", line 47, in <module>
    main()
  File "C:/Users/11929/PycharmProjects/untitled1/htmlfirst.py", line 13, in main
    getdata(baseurl = "https://movie.douban.com/top250?start=0")
  File "C:/Users/11929/PycharmProjects/untitled1/htmlfirst.py", line 37, in getdata
    soup = BeautifulSoup(html,"html.parser")
  File "C:\Users\11929\AppData\Local\Programs\Python\Python36\lib\site-packages\bs4\__init__.py", line 310, in __init__
    elif len(markup) <= 256 and (
TypeError: object of type 'NoneType' has no len()

crossin先生

html = gethtml(url)

gethtml没有返回值，所以html是None